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Below is a list of well-known TCP and UDP ports used by everyday applications and services.
Some of these ports are known to be used by viruses, and thus detection of heavy or regular pulses of
traffic on these ports can indicate infected machines on a network. To find further information on
common protocols, or read about ways of detecting such traffic on a network, the book Network programming in .NET
should be of invaluable assistance.

Port 1 tcp/udp

Port 2 tcp/udp

Port 2 tcp

Port 3 tcp/udp

Port 3 tcp/udp

Midnight CommanderSometimes this program is assigned to this port. Uses compressnet service.

Port 4 tcp

Self-Certifying File System(SFS)sfssd acceps connections on TCP port 4 and passes them to the appropriate SFS daemon. SFS is a secure,global file system with completely decentralized control. SFS uses NFS 3 as the underlying protocol for file access.

Port 4 tcp

Midnight CommanderSometimes this program is assigned to this prot

Port 5 tcp/udp

Remote Job Entry. Uses rje service.

Port 7 tcp/udp

Echo. Uses echo service.

Port 9 tcp/udp

Discard. Uses discard service.

Port 11 tcp/udp

Active Users. Uses systat service.

Port 13 tcp/udp

Daytime (RFC 867). Uses daytime service.

Port 17 tcp/udp

Quote of the Day. Uses qotd service.

Port 18 tcp/udp

Message Send Protocol. Uses msp service.

Port 19 tcp/udp

Character Generator. Uses chargen service.

Port 20 tcp/udp

File Transfer [Default Data]. Uses ftp-data service.

Port 20 tcp

Randex

Port 21 tcp

Back Construction,Blade Runner

Port 21 tcp/udp

File Transfer [Control]. Uses ftp service.

Port 21 tcp

Senna Spy FTP server

Port 22 tcp/udp

SSH Remote Login Protocol. Uses ssh service.

Port 22 tcp

Shaft

Port 22 udp

pcAnywhere(Used in older versions,though newer version still use it for backwards compatibility.)

Port 23 tcp/udp

Telnet. Uses telnet service.

Port 23 tc

Fire HacKer,Tiny Telnet Server - TTS

Port 24 tcp/udp

any private mail system

Port 25 tcp/udp

Simple Mail Transfer. Uses smtp service.

Port 25 tcp

Ajan,Antigen

Port 26 tcp

W32.Netsky

Port 27 tcp/udp

NSW User System FE. Uses nsw-fe service.

Port 29 tcp/udp

MSG ICP. Uses msg-icp service.

Port 30 tcp

Agent 40421

Port 31 tcp/udp

MSG Authentication. Uses msg-auth service.

Port 31 tcp

Agent 31,Hackers Paradise

Port 33 tcp/udp

Display Support Protocol. Uses dsp service.

Port 35 tcp/udp

any private printer server

Port 37 tcp/udp

Time. Uses time service.

Port 38 tcp/udp

Route Access Protocol. Uses rap service.

Port 39 tcp/udp

Resource Location Protocol. Uses rlp service.

Port 39 tcp/udp

Upfudoor

Port 40 tcp

Midnight CommanderSometimes access FTP servers running at this port.

Port 41 tcp/udp

Graphics. Uses graphics service.

Port 41 tcp

RAT: Deep ThroatPuts an FTP service at port 41 (TCP).Foreplay

Port 42 tcp/udp

Host Name Server. Uses name service.

Port 42 tcp/udp

Host Name Server. Uses nameserver service.

Port 43 tcp/udp

Who Is. Uses nicname service.

Port 44 tcp/udp

MPM FLAGS Protocol. Uses mpm-flags service.

Port 45 tcp/udp

Message Processing Module [recv]. Uses mpm service.

Port 46 tcp/udp

MPM [default send]. Uses mpm-snd service.

Port 47 tcp/udp

NI FTP. Uses ni-ftp service.

Port 48 tcp

DRAT

Port 48 tcp

DRAT

Port 48 tcp/udp

Digital Audit Daemon. Uses auditd service.

Port 49 tcp/udp

Login Host Protocol (TACACS). Uses tacacs service.

Port 50 tcp/udp

Remote Mail Checking Protocol. Uses re-mail-ck service.

Port 51 tcp/udp

IMP Logical Address Maintenance. Uses la-maint service.

Port 52 tcp/udp

XNS Time Protocol. Uses xns-time service.

Port 53 tcp/udp

Domain Name Server. Uses domain service.

Port 54 tcp/udp

XNS Clearinghouse. Uses xns-ch service.

Port 55 tcp/udp

ISI Graphics Language. Uses isi-gl service.

Port 56 tcp/udp

XNS Authentication. Uses xns-auth service.

Port 57 tcp/udp

any private terminal access

Port 58-59 tcp

DMSetup

Port 58 tcp/udp

XNS Mail. Uses xns-mail service.

Port 59 tcp/udp

any private file service

Port 61 tcp/udp

NI MAIL. Uses ni-mail service.

Port 62 tcp/udp

ACA Services. Uses acas service.

Port 63 tcp/udp

whois++. Uses whois++ service.

Port 64 tcp/udp

Communications Integrator (CI). Uses covia service.

Port 65 tcp/udp

TACACS-Database Service. Uses tacacs-ds service.

Port 66 tcp/udp

Oracle SQL*NET. Uses sql*net service.

Port 67 tcp/udp

Bootstrap Protocol Server. Uses bootps service.

Port 68 tcp/udp

Bootstrap Protocol Client. Uses bootpc service.

Port 69 udp

W32.Blaster.Worm,W32.Bolgi.Worm

Port 69 tcp/udp

Trivial File Transfer. Uses tftp service.

Port 69 tcp

W32.Evala.Worm,W32.Mockbot

Port 70 tcp/udp

Gopher. Uses gopher service.

Port 70 tcp

W32.Evala.Worm

Port 71 tcp/udp

Remote Job Service. Uses netrjs-1 service.

Port 72 tcp/udp

Remote Job Service. Uses netrjs-2 service.

Port 73 tcp/udp

Remote Job Service. Uses netrjs-3 service.

Port 74 tcp/udp

Remote Job Service. Uses netrjs-4 service.

Port 75 tcp/udp

any private dial out service

Port 76 tcp/udp

Distributed External Object Store. Uses deos service.

Port 77 tcp/udp

any private RJE service

Port 78 tcp/udp

vettcp. Uses vettcp service.

Port 79 tcp/udp

Finger. Uses finger service.

Port 79 tcp

RAT:FirehotckerRequires VBCDK

Port 80 tcp/udp

World Wide Web HTTP. Uses www service.

Port 80 tcp/udp

World Wide Web HTTP. Uses www-http service.

Port 80 tcp

711 trojan (Seven Eleven),AckCmd

Port 80 tcp/udp

World Wide Web HTTP. Uses http service.

Port 81 tcp/udp

HOSTS2 Name Server. Uses hosts2-ns service.

Port 81 tcp

RemoConChubo,Xeory

Port 82 tcp/udp

XFER Utility. Uses xfer service.

Port 82 tcp

W32.Netsky

Port 83 tcp/udp

MIT ML Device. Uses mit-ml-dev service.

Port 84 tcp/udp

Common Trace Facility. Uses ctf service.

Port 85 tcp/udp

MIT ML Device. Uses mit-ml-dev service.

Port 86 tcp/udp

Micro Focus Cobol. Uses mfcobol service.

Port 87 tcp/udp

any private terminal link

Port 88 tcp/udp

Kerberos. Uses kerberos service.

Port 89 tcp/udp

SU/MIT Telnet Gateway. Uses su-mit-tg service.

Port 90 tcp/udp

DNSIX Securit Attribute Token Map. Uses dnsix service.

Port 91 tcp/udp

MIT Dover Spooler. Uses mit-dov service.

Port 92 tcp/udp

Network Printing Protocol. Uses npp service.

Port 93 tcp/udp

Device Control Protocol. Uses dcp service.

Port 94 tcp/udp

Tivoli Object Dispatcher. Uses objcall service.

Port 95 tcp/udp

SUPDUP. Uses supdup service.

Port 96 tcp/udp

DIXIE Protocol Specification. Uses dixie service.

Port 97 tcp/udp

Swift Remote Virtural File Protocol. Uses swift-rvf service.

Port 98 tcp/udp

TAC News. Uses tacnews service.

Port 99 tcp/udp

Metagram Relay. Uses metagram service.

Port 99 tcp

Hidden Port,NCX

Port 100 tcp

[unauthorized use]. Uses newacct service.

Port 101 tcp/udp

Udps

Port 101 tcp/udp

NIC Host Name Server. Uses hostname service.

Port 102 tcp/udp

ISO-TSAP Class 0. Uses iso-tsap service.

Port 103 tcp/udp

Genesis Point-to-Point Trans Net. Uses gppitnp service.

Port 104 tcp/udp

ACR-NEMA Digital Imag. & Comm. 300. Uses acr-nema service.

Port 105 tcp/udp

CCSO name server protocol. Uses cso service.

Port 105 tcp/udp

Mailbox Name Nameserver. Uses csnet-ns service.

Port 106 tcp/udp

3COM-TSMUX. Uses 3com-tsmux service.

Port 106 tcp

allows passwords to be changed on POP servers. Traditionally,users would have to have shell (Telnet) accounts on the servers in order to change their passwords. This allows users with just POP access to change their passwords.. Uses poppassd(epass) service.